In this release, our conformance has grown to 94.12% in the official ECMAScript Test Suite (Test262).

Highlights

• Polished our implementation of the Temporal proposal to reach ~97% conformance on Temporal-related tests.
• Added support for span nodes and error backtraces.
• Enhanced Boa's compatibility with async Rust by revamping JobQueue and asyncifying ModuleLoader.
• Introduced a new set of macros to facilitate creating ECMAScript values, classes and modules from Rust code.
• Implemented several runtime features in boa_runtime, including fetch, setTimeout, and queueMicrotask.
• Added some support for conformance testing runtime features against the Web Platform Tests (WPT).
• JsValue now uses a Nan-boxing representation, reducing the memory footprint of the engine.
• Migrated from a stack-based VM to a register based VM.

New built-ins

• Implemented Atomics.waitAsync.
• Implemented new Set methods.
• Implemented Float16 support in TypedArray, Dataview and Math built-ins.
• Implemented Error.isError.
• Implemented Math.sumPrecise.
• Implemented Array.fromAsync.

Changelog